Ignition-dynamo.



c. T. MASON.

IGNITION DYNAIIIIo. APPLICATION FILED MINE l. |912'.

Patented May 25, 1915.

me/Moz UNITED striiimsgrrnnr onirica.v

CHARLES THOMAS MASON, F SUI/ITER, SOUTH CAROLINA, ASSIGNOB TO SMTEB ELECTRICAL COMPANY, A CORPORATION 0F 'SOUTH CAROLINA.

Specication of Letters I-Patent.

l Patented May 25, 1915.

v Application led .Tune 1, 1912. I Serial No. 760,933.

To all whom it may concern: i

Be it known that I, CHARLES THOMAS I MASON, a citizen-of the United States, residtion-Dynamos, ofl which the followingis a specificatiomjreference being had to the accompanying drawing. y

Myinxention relates to ignition dynamos,

. and particularly to thoser of the magneto type.

The objects of 'my-invention are; to provideia machine of increased eiiiciency ir. which'the spark is of the same intensity in either the advance or retard position; to eliminate all sliding contacts and the consequent danger of loose connections; to provide a device which is' readily timed with the engine Without the necessity of means to indicate the position of the armature; to reduce the `cost of manufacture and .simplifythe various parts; and to provide a method of revolving the iield and armature in opposite directions for producing av good igniting current at veryslow speeds.

AFigure l is a. sectional longitudinal view of my magneto. Fig. 2 a sectional view on the line a Z) Fig. 1. Fig. 3 a detailed view of the bearing cap, and Fig. 4 a method of driving the field and armature structures in opposite directions. I

Like figures of reference. denote the same parts Whereverthey are shown,

1 denotes a suitable base carrying the supports 2 and 3 for the armature shaft 4. The armature shaft is movable in these supports, which also form a bearing lfor a movable fleldstructure consisting of the end plates 5 and 6, carrying a Ysuitable magnet '7. By means of the gear 8, thisstructur'e may be revolved. This movable field structure is carriedin bearings in supports 2 and 3,

said supports beingcut away Vso that theyv do not touch the armature shaft 4. y

To the end plates 5 and 6 and the magnets 7 is attached the pole shoes 9 and 9, which revolve with the magnet. structure. These may be under cut toward the magnet as shown.

The armature 10 is supported-by means which is grounded atl, the other end `con- A igniter, engine and dynamo.

' necting at 15 'with a suitable terminal; this end of the Wiiiding is insulated from the armature shaft by means of the bushing 16. A suitable wire 17 may be connected to 'the terminal for conducting the current' to the engine igniter, the other side of the circuit being completed through the frame of the Where Athe armature is rotated, any Weil known formL of slip joint, many otwhich are Well known, may be used instead of the formas shown.

A handle or other means 18 is provided whereby vthe armature may be moved so that the spark is advanced orretarded, and as this movement does not vary the relative position of the armature in relationto the pole shoes and tlie operation of the engine igniter, the intensity of the. spark remains the same With the armature 1n any position.

Furthermore there is no limit to the amount of variation between the Aadvance and reta position, as 'the armature may be mov through a complete revolution. it 1s obvii ons that the armature may be fixed in anydesired position, by any suitable means. A magneto of this description may be belt or friction driven, but. is primariiy designed to be driven by gears or a chain in time With the engine ignitergand sometimes it is de- Y sirablelto have the magneto moving at more than engine speed, or at a greater speed than can'be obtained by gears of convenient size. Now it is obvious that if, the magnet field structure was moved in onedirection and the armature in the reverse direction from the magnets, the speed of the moving.

desirable condition by any suitable arrangement of gearing such as that shown in Fig. 4. The internal gear 19 is mounted on the magnet structure and'nieshed with the gear 20 mounted on a shaft 2l, which is driven by the engine. This shaft also carries gear 22, which meshes with gear .23 connected to the armature shaft fi. it will-be yobvious that .as theshaft Q1 revolves, themagnet structure driven by gear it? xviii turn in one direction, While the armature structpres carried by shaft a Wiil revoive in the other direction and that the speed at lwhich the inagnetie Hui: is reversed through the winding will be greater than it would be either part was still. By this method, I obtain a. current ofhgh igniting eiciency and yet the vmovement of the parts and the wear on the bearings is reduced to a minimum. The parts 20, 2l, and 22, are properly a part of the engine, but are. here'shown and described to illustrate the operation of the magneto.

The structural details of a magneto of this type may be varied Within Wide limits Without departing from the essential feaner that -will be readily understoodI by any mechanic.

` I claim:

In an ignition dynamo, an armature, a shaft therefor, supports' for said shaft, a field structure revoluble aboutsaid armature comprising a plurality of circular permanent magnets, end plates secured to said magnets and forming therewith a housing forysaid armature, supports for said field structure concentric With said armature s'lipports'and Clear from said shaft, driving means secured to said field structure whereby same may berevoled, means connected to said armature whereby its position may be manually varied, and a circuit connection throughl said shaft to said armature.

In testimony whereof I hereunto aiiix my signature inthe presence of two Witnesses.

CHARLES THOMAS MASON. lrVitnesses:

H. R, VAN DEVENTER,- 1 F. C. Maritimo.YY

copies of this patent may `be obtained for five cents each.. by addressing the Commissioner of- Patents,

. Washington, D. U." 

